The passlock sensor starts to fail with age and the signs you describe appears like you've a passlock sensor concern. Have you seen whether or not or now not the security gentle is on when it is not going to ? I am assuming it's. The passlock sensor is built-in into ignition lock housing, not the ignition lock cylinder however the housing it goes into, and the contact pins in the passlock sensor are susceptible to carbon buildup because of arcing and that carbon buildup motives intermittent passlock method failure. You could have 2 choices. You could substitute the passlock sensor (aka passlock switch or ignition lock housing), that allows you to fee about $125 plus labor, or you can disable the passlock process. Should you opt for to disable the passlock approach, just Google disable GM passlock system. There are tons of websites with instructions to support you do this.
Bruce J W
2012-11-13 10:54:54 UTC
you need to clean throttle body on the back side and ck for a vacum leak. Idle is supposed to be around 675 in neutral. the computer takes care of this. If you mean that it stays at 1200-1500 rpm that's to high. On a cold start (after sitting 6-8 hrs) should first run 1200 -1500 then idle down to 675 . really sound slike a vac leak that closes after engine has run a min or so.
?
2012-11-13 09:44:42 UTC
It sounds like a sticking or inoperative idle control valve which is actually a motor. It is connected to a hole in the throttle body. It opens and closes the hole to change the idle speed when needed. It is used to control idle when cold and when you turn on your A/C.
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